Insulator



July 23,1929.

S. C. CUTTER INSULAT OR Filed Dec. .2, 1926 Patented July 23, 1929.

UNITED STATES SCOTT C. CUTTER, l OSWEGO, ILLINOIS.

msum'rn.

Application led December 2, 1928. Serial No. 152,079.

'lhe present invention pertains in general to insulators and more particularly to linereceiving insulators of the same general type as that disclosed in my Patents N o. 758,175,

issued April 26, 1904, and No. 1,620,804, is-

sued March 15, 1927.

The insulator of my present invention, like that of my patent, includes a body por.- tion and a projecting or hook portion which cooperates with the body portion to define a slot communicating with a pocket located between the two portions.v Also, the insulator is provided with a .pair of spaced holes or apertures for enabling the insulator to be fastened to a suitable support.

l/Vhile the insulator of my Patent 1,620,804 is very eliicient in many respects, I have found that it is open to two objections-it does not possess proper mechanical strength to resist severe strains, and its insulating properties whenv used lunder conditions of extreme moisture are not as high as desirable. The lack of mechanical strength is attributable to the fact that the opening or pocket which receives the wires is disposed at a very decided acute angle to the base of the insulator, this angle being somewhat less than 40. This renders .it necessary to enlarge the lower portion of the pocket relative to the upper portion to properly retain the wires. As a result, the pocket is unsymmetrical and the material between the innermost portion of the pocket and the base of the body of the insulator, and between the lowermost point of the pocket and the lower end of the insulator, the two points subjected to the greatest strains, is so reduced in thickness as not to possess the mechanical strength to resist the severe strains to which the insulator is subjected during "severe windstorms or under other conditions causing violent swaying of the treesor similar supports to which the insulators are applied. When this insulator is used in wet weather or under conditions of moisture 'there is a tendency for a lilm or coating of moisture to form between the pocket andI ness ofi material at the points subjected to greatest strains. By providing suitable ribs about the inner portion of the pocket I prevent leakage to the supporting member due to the formation of a moisture iilm. This increases the insulating propertieso the insulator, and these ribs also serve to very materially increase the mechanical strength of that portion of the insulator which is subjected to the most severe strains in use.

My present insulator differs from that of my prior patents, particularly' that of my Patent 1,620,804 in that it has a laterally projecting rib on each of its sides located between the pocket and the pair of spaced apertures, and in that the pocket is symmetric about an oblique plane extending through the center of the slot of the insulator. The pocket-and slot are preferably inclined outwardly and away from the body portion. 4

The insulator is fastened to a mounting member including two pairs of ears which embrace the body portion of the insulator adjacent the holes therein. A. fastening element or bolt extends through each of the holes in the insulator for securing the body portion to 'the contiguous pair of ears of the mounting member.

The laterally projecting rib or flange provides additional insulation between the pocket and the mounting member. In fact, this rib serves to prevent any moisture which might f accumulate on theside of the insulator from short circuiting the line in the pocket. Then, too, the pair of ribs on the sides of the insulotor resist stresses imposed on the insulator adjacent the pocket and thus greatly increase the strength of Ithe device.

Other objects and advantages of my invention will more fully appear from the following detail description taken in connection with the accompanying drawing which illustrates one embodiment thereoi:` and, in which:

Figure 1 is a side view of my novel insulator illustrating it as being applied to a tree;

Figure92 is a sectional view taken on substantlally the line 22 of Figure 1, looking in the direction indicated by the arrows;

Figure 8 lis a sectional view taken on substantially the line 3*3 of Figure 1, looking in the direction indicated by the arrows; and

Figure/lis a sectional view taken on the line 4 4 of Figure 1, looking downwardly.

Referring now to the drawings in detail in which like reference 'numerals designate simi, lar parts throughout` the several views, denotes generally the insulator of my invention, 11 represents the mounting for the insulator and 12 indicates the support or tree to which the mounting is fastened.

The insulator 10 comprises a body portion 13 substantially rectangular shape anda proj ecting or hook portion 14 spaced from and cooperating with the body portion to define 4portion 13. By inclining the pocket I nd that I am enabledto employ a shorter hook portion 14 and to make the insulator considerably lighter and smaller. f

To prevent the cable or conductor 17 ,when

installed, from lodging and getting pinched .y in any way, I have shaped the pocket 16 so its inner curvature is nowhere small enough to permit it to pinch the largest line or cable rhatcan be inserted through the slot 15. 'Rei'erring to Figure 1,:it will be-observed that the hook portion 1 4 has aprong18 and the body portion 13 has a prong 19, which prongs partly define the curvature vofthe pocket 16. vThe hook portion 14 is provided with a curved portion 20 disposed adjacent the prong 18.. This curvature 20 has a radius of substantially half the width of the oblique slot 15. The curved portion 20 connects with a curved portion 21 having-a relatively great' radius. Also, disposed between the prong 19 and the curvature 21 is a curved portion 22, the radiusof which is equal to substantially half the width of the slot 15. Thus it will be readily apparent/that it is impossible for the largest hne 'or cable that can be inserted in the .insulator through the slot 15 from becoming wedged back of either of the two. p rongs 18 and 19. Moreover, the surface delinmg the pocket 16 is preferably glazed throughout so as to provide a smooth surface for the conductor 17 to engage, thus preventing the insulator from'abrading or cuttin into the insulation of the cable. hebodyportion 13, asbest shown in Figure 3, 1s provided with'a pair of spaced holes or apertures 23 and 24 adapted tov enable the insulator to be fastened to, the mounting 11. Each side of the insulator 10 is provided with a curved laterally extending rib or flange 25 located between the pocket 16 and the openings 23 and 24. This flange or rib 25 provides additional insulation between the pocket and the mounting 11. Moreover, the rib serves m'u ate on the side of the insulator from short circuiting the line in the pocket, as is readily evident. Then, too, the two ribs 25 resist thel shearing stresses imposed on the insulator adjacent the pocket and thus add greatly to the strength of the insulator? The portion of the body portion 13 between the openings 23 and 24, as best shown in Figures 1 and 2, is recessed at 26 in order to lighten the insulator. Also, the side of the insulator adjacent the mounting 11 is preferably provided with a corrugated arcuate surface 27 which rests onrftheback piece 28 of the mounting 11.

The back piece 28 is arcuate in shape and has-formed integral therewith two pairs of laterally extending ears 30 adapted to embrace the side of the body portion 13 adjaycent the openings-23 and 24. The entire mounting is preferably made of suitable metalsuch, for example; as galvanized, iron. A` bolt 31 extends through each ofthe openings 23 and 24 in the insulator and serves to secure the insulator to the associated pair of laterally extending ears 30. A nuth 32 is threaded upon the end 0f each of the bolts 31. It will, therefore, be evident that the insulator is readily detachable from the mounting 11. F

The back piece 28 of the mounting'll is provided 'with two circular depressions.33-33, each of which is located immediately behind the corresponding pair of ears 30. Each of these vdepressions 33 is also provided with an I axial opening 34 adapted to receive a screw or nail 35 by. means of which the mounting member is fastened tothe support or tree 12. The head-,ofl each screw or nail 35 is lodged in the assf'ciated depression 33, as best shown in Fi re 4. y y

Also, it should be noted that one of the transverse openings in the insulator, namely, opening 23, is disposed above the pocket 16 and the other opening 24 is disposed below the pocket 16. Each of these openings is adaptedto register with openings or holes 37 in the associated ears 30. f'

In practice, the mounting 11is first nailed or screwed to the tree trunk, pole, building, or other support12 in the desired position. Thereafter the insulator is inserted in the mounting and the bolts are applied to tightly clamp the insulator to the vears 30. Then the conductor, or conductors, is passed through l the slot 15 into the pocket 16.

Now I desire it understood that although I have illustrated and described in detail the preferred embodiment o f my invention, the invention is not to be thus limited but only in so far as defined by the slcope and spirit of the appended claims.

I claim y 1. In an insulator, a body,- a projection associated with the body having its free end portionof the insulator and the other pair j spaced from said body to form a line-receiving slot which communicates with a pocket deiined on one side b the body and on the other side by the projection, sald body having transverse holes for enablin it-to be fastened to an object, and a/lateral y projecting rib disposed between the holes and the pocket for strengthening the insulator at the pocket and for increasing the insulation between the holes and the pocket.

2. In combination, an insulator having a pocket for receiving a wire conductor, a mounting member comprising a back piece against which the insulator may bedisposed, said back piece having connected thereto two pairs of ears extending laterally therefrom, one pair being adapted to embrace the upper being adaptedto embrace the lower portion of the insulator, a member connecting each pair of ears and extending through the-adja cent portion of the insulator for securing it lto the insulator, and a fastening element back c of each pair of ears for enabling the mountl ing member to be attached to a suitable support, said insulator having formed integral with it a laterally projecting rib between the pocket and the fastening members for strengthening the insulator at the pocket and for preventing moisture from short circuiting the conductor in the pocket through the'- fastening members.

3. In an insulator, a substantially rectanceiving opening passing through said body from side to side, a slot leading to said opening from the upper front portion of the body, and insulating and reinforcing ribs projecting laterally Ifrom the sides of said body alongside said opening to the rear thereof.

5. In an insulator, a body having a back and sides in rectangular relation, a pair of holes for the reception of fastening means passing through said body from side to side Vand disposed toward the back thereof, a wire receiving opening passing through said body from side to side and located forwardly of the'vertical plane of said holes, a slot leading to said opening from the upper front portion of the body, and insulating and reinforcing ribs projecting laterally from the sides of said body between said holes and said opening.

In witness whereof, I hereuntosubscriba my name this 24th da of November, 1926.

S 'OTT C. CUTTER. 

